The term 'postwar pact' refers to a TREATY and an organization created in the aftermath of World War II. The first solution is 'TREATY, ' which is a formal agreement between two or more countries, usually written down and often ratified by their respective governments. The second solution is 'NATO, ' which stands for the North Atlantic TREATY Organization. NATO was established in 1949 as a military alliance between the United States, Canada, and several European countries to protect against the threat of Soviet aggression.